Open System Interconnection Model is commonly known as the OSI/ISO Model. It was developed by the ISO (International Organization for Standardization). It is a standard model for networking protocols and distributed applications
WHAT IS AN OSI MODEL?
OSI model is a standard for communication that basically defines a networking framework; it’s a set of protocols that identify and regulates all the data communication practices. Most of the network communications used these days are structured on the basis of the OSI model.
HOW DOES AN OSI MODEL WORKS?
Information from an application in a computer is transmitted which is then received on to an application in another computer through a network medium, the OSI model segregates this communication process or tasks into seven different layers, by passing the control from one layer to the other. At the senders station the control of the data flow starts from the application layer and then working down through the model where
* CCNA TRAINING – NETWORK TOPOLOGY
In order to understand what exactly network topologies are; we first have to understand the meaning of the term \”network\”. The term \”network\” means a series of nodes or points (computers) interconnected with each other by communication paths or some kind of an interface, where as in networking the term \”topology\” refers to the arrangement of these nodes in a network or in other words it describes the layout of the connected devices.
* CCNA TRAINING – Natural SEO Service
What is a SEO? Before going into any details let us understand the term SEO. SEO stands for Search Engine Optimization. The SEO means promoting you website within all the search engines. The purpose of promoting your site in the listings is to ensure that more number of people will visit it as it’s on the initial pages of the searched results.
* Design Series – OSI Model
An enterprise network is a large network comprised of hundreds or thousands of workstations all connected with WAN circuits across many states and/or countries. The components are comprised of network devices, circuits, servers, applications, security and network management that connect employees for the purpose of supporting business processes. It is business processes that make companies profitable.
* Ccna \”�\” Ccnp Training \”�\” Offset Lists
As a CCNA / CCNP candidate you are expected to understand EIGRP Offset listse as at the receivers station control is then back up to the top layer.
THE SEVEN LAYERS OF THE OSI MODEL:
Each layer of the OSI model functions on the principle of providing services to the top layer and obtaining services from the bottom layer.
Seven layers of the OSI model are divided into two basic groups or sets: The Upper Layers or The Application set and The Lowers Layers or The Transport set.
The Application Set:
This set includes layer 7, 6 and 5; these layers handles all the application based functions (data encryption, formatting etc).
The Transport Set:
This set includes layer 4, 3, 2 and 1; these layers handles all the data transport functions (Data routing, addressing and flow control etc).
The seven distinct layers of the OSI model are as follows:
This layer carries the raw bit stream through the network it corresponds to basic network hardware.
1. 2.Data Link-
This layer organizes data into frames and then delivers these frames between the sending and the receiving party.
This layer routes the packets (information) through out the network and determines that how the data will be transmitted between the network devices.
This layer provides data transfer between the communicating parties; it’s responsible for flow of control and error free data recovery, in short handles all the end to end connection details.
This layer establishes, manages and then terminates a communication session.
This layer encrypts decrypts compresses and formats the data and ensures that the data is readable.
This layer specifies how one particular application uses a network.
BENEFITS OF USING OSI MODEL:
There are many advantages of using the OSI model but the two most important benefits are:
* OSI model does not depend on the operating system; that is why different operating systems using the OSI model can easily communicate with one another.
* If errors occur in any layer then they can be detected and handled; as error checking schemes are implemented at each layer of the OSI model.